Substitution technique is a classical encryption technique.
Types of classical encryption techniques are:
substitution techniques
transposition technique
A substitution technique is one in which the letters of plaintext are replaced by other letters or by numbers or symbols.
Substitution Technique:
Caesar Cipher
Monoalphabetic Cipher
Playfair Cipher
Hill Cipher
Polyalphabetic Cipher
One-Time Pad
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#HillCipher
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#One-TimePad
Transposition technique is a cryptographic technique that converts the plain text to cipher text by performing permutations on the plain text i.e change the position of each character of plain text for each round.